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Logic

Logic

Logic forum

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Texas Instruments (TI) Logic support forum is an extensive online knowledge base where millions of technical questions and solutions are available 24/7. You can search logic IC content or ask technical support questions on everything from voltage level translation and transceivers to standard logic gates and specialty logic devices. Find the right solution for your circuit design challenges by using our TI E2E™ support forums that are supported by thousands of contributing TI experts.
Frequent questions
  • [FAQ] How does a monostable multivibrator (one shot) work?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Monostable Multivibrators >> Current FAQ The above functional block diagram shows generally how a monostable multivibrator (MMV, or one-shot) works. Not all of them have every part shown, but this is the most common…
    • over 5 years ago
    • Logic
    • Logic forum
  • [FAQ] What's the difference between TTL and 5V CMOS logic?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Logic Technology >> Current FAQ It's very common for people to refer to "TTL logic" and to actually mean "5V logic" -- but how are they different? The key difference is in the input and output voltages. This graphic…
    • over 5 years ago
    • Logic
    • Logic forum
  • [FAQ] What is the difference in timing between gates in the same device? How much skew is expected within a given logic device? What is the part-to-part skew?

    Karan Kotadia
    Karan Kotadia
    FAQ: Logic and Voltage Translation > Timing Parameters >> Current FAQ The difference in delay between the individual channels on an individual part is referred to as channel-to-channel skew or output skew. This is typically not covered as a datasheet…
    • over 5 years ago
    • Logic
    • Logic forum
  • [FAQ] What is the difference between the SN74HCxx and the SN74HCxxA?

    Emrys Maier
    Emrys Maier
    Other Parts Discussed in Thread: SN7400 , SN74LS00 FAQ: Logic and Voltage Translation > Logic Technology >> Current FAQ The High-speed CMOS (HC) logic family was created as a direct replacement for older bipolar junction transistor based transistor…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What method is best used for estimating specification values between those given in the datasheet?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Input Parameters >> Current FAQ The most common example of this question comes from the fact that Standard Logic devices are specified at 1.65V, 3V, and 4.5V, however most engineers use our devices at 1.8V, 3.3V…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] When will TI End of Life (EOL) or Obsolete a certain logic device?

    Emrys Maier
    Emrys Maier
    FAQ: Logic and Voltage Translation > Quality and Manufacturing >> Current FAQ TI's General Quality Guideline (page 7) describes our official policy on obsoleting a device. This policy is summarized below. TI's Product withdrawal/discontinuance process…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What are the power sequencing requirements for the translation device?

    ShreyasRao
    ShreyasRao
    FAQ: Logic and Voltage Translation > Voltage Translators >> Current FAQ Some of the TI translators have requirements during normal operation mode to have Vcca <= Vccb ( TXS/ TXB01xx) or Vrefb>= VrefA+0.8V(LSF). However, the TI translation devices do…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What is the difference between IOFF and VCC isolation? What are the conditions to guarantee it?

    ShreyasRao
    ShreyasRao
    FAQ: Logic and Voltage Translation > Logic Technology >> Current FAQ The I OFF specification guarantees the I/O ports are in high impedance whenever either one of the power supply is at pulled to ground (0V) or close to gnd(<100mV as specified for the…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] What should be done with unused I/O pins of the level translator devices?

    ShreyasRao
    ShreyasRao
    FAQ: Logic and Voltage Translation > Voltage Translators >> Current FAQ For the TXB family, unused I/O ports are recommended to be tied to GND through a weak pulldown resistors (>=100kohm). For TXS devices, the internal 10kohm pull-ups resistors will…
    • over 6 years ago
    • Logic
    • Logic forum
  • [FAQ] Why is there no PSpice model for a Monostable Multivibrator device?

    Emrys Maier
    Emrys Maier
    Other Parts Discussed in Thread: SN74LVC1G123 FAQ: Logic and Voltage Translation > Monostable Multivibrators >> Current FAQ To make a long post short: MMVs cannot be directly simulated by PSpice because of their direct dependence on external components…
    • over 6 years ago
    • Logic
    • Logic forum
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  • Not Answered

    Automotive voltage level translation from 12V to 3.3V 0 Locked

    16643 views
    6 replies
    Latest over 8 years ago
    by Emrys Maier
  • Answered

    SN74ACT244: risk when Vcc=0V, input/output with high logic 0 Locked

    3207 views
    6 replies
    Latest over 8 years ago
    by Emrys Maier
  • Answered

    SN74AUP1G79 power up state 0 Locked

    1501 views
    5 replies
    Latest over 8 years ago
    by Emrys Maier
  • Suggested Answer

    SN74LVC2T45: Inverting version of 74LVC2T45 level shifter 0 Locked

    1821 views
    4 replies
    Latest over 8 years ago
    by Emrys Maier
  • Answered

    Non-Inverting Buffer with different input/output voltage 0 Locked

    861 views
    1 reply
    Latest over 8 years ago
    by Clemens Ladisch
  • Suggested Answer

    How to select an appropriate level translator? 0 Locked

    2073 views
    3 replies
    Latest over 8 years ago
    by Clemens Ladisch
  • Suggested Answer

    SN74LVC8T245: 74LVC8T245 1.8V input driven with 1.5V logic driver 0 Locked

    887 views
    3 replies
    Latest over 8 years ago
    by aozer
  • Not Answered

    Bidirectional translation for SPI at 66MHz w/30pF load 0 Locked

    754 views
    2 replies
    Latest over 8 years ago
    by Emrys Maier
  • Suggested Answer

    SN74AVC32T245: Meeting timings after voltage level translator for High speed data bus 0 Locked

    608 views
    3 replies
    Latest over 8 years ago
    by aozer
  • Suggested Answer

    SN74221: SN74221: Resolution of the pulse generated 0 Locked

    642 views
    1 reply
    Latest over 8 years ago
    by Emrys Maier
  • Answered

    For the txs0102 there is a requirement for VCCA<=VCCB. What happens to the device if this condition is not met? 0 Locked

    730 views
    3 replies
    Latest over 8 years ago
    by JC
  • Answered

    SN74LVCC4245A: Maximum input frequency range 0 Locked

    769 views
    3 replies
    Latest over 8 years ago
    by Karthick M12
  • Suggested Answer

    SN74LVC1G123: SN74LVC1G123 minimum retrigger time calculation 0 Locked

    1147 views
    10 replies
    Latest over 8 years ago
    by Emrys Maier
  • Suggested Answer

    SN74GTL2014: TI GTL2014 design doubt 0 Locked

    1690 views
    5 replies
    Latest over 8 years ago
    by Emrys Maier
  • Suggested Answer

    SN74125: OE# pin frequency characteristic of SN74LVC1G125 IC. 0 Locked

    2616 views
    5 replies
    Latest over 8 years ago
    by Emrys Maier
  • Suggested Answer

    TXB0104: Dose TXB0104 have internal pull up/down? 0 Locked

    686 views
    1 reply
    Latest over 8 years ago
    by Clemens Ladisch
  • Not Answered

    SN74LVC541A: Failure rate calculation at 30°C 0 Locked

    727 views
    3 replies
    Latest over 8 years ago
    by Emrys Maier
  • Suggested Answer

    SN74VMEH22501: ringing 0 Locked

    649 views
    1 reply
    Latest over 8 years ago
    by Emrys Maier
  • Discussion

    SN74ACT240: Output Voltage Level & current values at differnt temp Locked

    740 views
    4 replies
    Latest over 8 years ago
    by Joe Stephan
  • Answered

    SN74HC595: Serial Output like NXP 74HC595 0 Locked

    776 views
    1 reply
    Latest over 8 years ago
    by Emrys Maier
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